On 2011-01-20 04:09, Gerrit Eichner wrote:
Try
plot (1, 1, ylab = expression (Z[list(i,i)]))
Hth -- Gerrit
-------- Original Message --------
Subject: puzzled with plotmath
Date: Thu, 20 Jan 2011 12:48:18 +0100
From: Claudia Beleites<cbelei...@units.it>
To: R Help<r-help@r-project.org>
Dear all,
I'm puzzled with matrix indices in plotmath.
I'm plotting matrix elements: Z [i, i], and I'd like to put that as label.
I'll
describe what I want and what I get in LaTeX-notation.
The output should look like Z_{i, i}, and my first try was
plot (1, 1, ylab = expression (Z[i, i]))
That, however, gives me Z_{i} (no comma, no second i) although the expression
looks OK to me:
a<- expression (Z[i, i])
a [[1]]
Z[i, i]
str (as.list (a [[1]]))
List of 4
$ : symbol [
$ : symbol Z
$ : symbol i
$ : symbol i
I'm able to tweak the ouput looking as I want:
plot (1, 1, ylab = expression (Z[i][", "][i]))
which is, however, logically very far from what I want to express.
What am I missing?
I'm almost sure this has been discussed before, but I can't find it: can
anyone
point me to good search terms? Is it possible to search for the terms being
close to each other in RSiteSearch and/or RSeek? I get lots of introductory
documents as they point to plotmath and discuss matrices...
[snip]
Claudia,
Look for 'comma-separated list' on the help page!!
It will lead you directly to Gerrit's solution.
I would put a space in front of the first 'i' with
expression(Z[list(~i,i)])
or you can build it all up in pieces:
expression(Z[~i*","~i])
Peter Ehlers
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